"How small we feel with our petty ambitions and strivings in the presence of the great elemental forces of Nature!"

"Mediocrity knows nothing higher than itself, but talent instantly recognizes genius."

"It is not my intention to be fulsome, but I confess that I feel the most profound respect for the man for whom no mystery is too abstruse, and no problem too intricate."

"Education never ends, Watson. It is a series of lessons, with the greatest for the last."

"The world is full of wonders, if only we open our eyes."